Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

To remove an extension from the list of bypassed extensions, click the trash can 
icon next to the extension in the File Extensions to Bypass list.

When bypassing file extensions, files within container files (a .doc file within a 
.zip, for example) are bypassed if the extension is in the list of extensions to 
bypass. For example, if you add .doc to the list of extensions to bypass, all .doc 
files, even those within container files are bypassed.

Enable Message Modification if you want the appliance to scan messages for 
non-viral threats, such as phishing attempts or links to malware websites. 

Based on the message’s threat level, AsyncOS can modify the message to rewrite 
all of the URLs to redirect the recipient through the Cisco web security proxy if 
they attempt to open the website from the message. The appliance can also add a 
disclaimer to the message to alert the user that the message’s content is suspicious 
or malicious. 

You need to enable message modification in order to quarantine non-viral threat 
messages.

Select a Message Modification Threat Level threshold from the list. This setting 
determines whether to modify a message based on the threat level returned by 
CASE. A smaller number means that you will be modifying more messages, while 
a larger number results in fewer messages being modified. Cisco recommends the 
default value of 3.

You can alter the text of the Subject header on non-viral threat messages 
containing modified links by prepending or appending certain text strings to 
notify users that the message has been modified for their protection.